Seco 10139711 M30 Straight Flute Tap 4 Flutes Hss-e Tn

Product Description

The SECO 10139711 is a straight flute machine tap designed for threading M30 metric holes in production and maintenance environments. Built from High-Speed Steel-E (HSS-E) and coated with a TiN (TN) finish, this tap handles blind hole threading with a semi-bottoming chamfer that allows threading close to the bottom of the hole. It carries a 6H class of fit, which is the standard tolerance for general-purpose metric threads. The 180 mm overall length and 45 mm thread length suit medium-to-heavy fastener applications. Installation is performed by licensed machinists and toolroom professionals using CNC tapping centers or manual tapping machines.

This tap is intended for blind hole threading operations across a range of workpiece materials including steel, stainless steel, cast iron, and non-ferrous metals. The semi-bottoming chamfer with a 3.50 mm thread pitch makes it well-suited for applications where the threaded hole does not pass fully through the part and the thread must begin close to the hole bottom. It belongs to SECO Series T32 and is sized for M30 fastener applications commonly found in heavy machinery, structural fabrication, and industrial equipment manufacturing.

Key Features

• M30 metric thread with 3.50 mm pitch and 6H class of fit for standard tolerance threading
• Semi-bottoming chamfer allows threading near the bottom of blind holes
• HSS-E substrate provides increased toughness and wear resistance over standard HSS
• TN (TiN) coating reduces friction and extends tool life in steel and stainless steel
• 4 straight flutes for efficient chip evacuation in short-chipping materials
• No coolant-through design — standard external coolant or cutting fluid application
• Right-hand thread direction, compatible with standard tapping cycles

Compatibility

Designed for use in blind hole threading of steel, stainless steel, cast iron, and non-ferrous metals. Suited for CNC machining centers and manual tapping machines that accept straight-shank taps with a 22 mm shank diameter. Part of the SECO Series T32 tap line.

Installation Notes

Machine taps of this size should be installed by qualified machinists following shop safety procedures. Power down and lock out the tapping machine before changing tooling. Ensure the tap holder or chuck is rated for the shank diameter and torque range of an M30 tap. Use appropriate cutting fluid or coolant for the workpiece material to prevent galling, especially in stainless steel applications.